JPH11217740A - Yarn blended with acrylic fibers having plural deniers and modified cross sections and its production and spinneret used therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a yarn blended with acrylic fibers having plural deniers and modified cross sections and having a new touch, to provide a method for producing the blended yarn, and to provide a spinneret used therefor and having excellent spinning stability. SOLUTION: This blended yarn blended with acrylic yarns having plural deniers and modified cross sections has a single fiber fineness ratio of 1.5/1 to 20/1 and a single fiber number ratio of 1/30 to 1/1 between large fineness fibers and small fineness fibers, has a large fineness single fiber fineness of 3-15 denier and a small fineness fiber fineness of 0.3-1.5 denier, and has different cross sections between the large fineness fibers and the small fineness fibers. This method for producing the blended yarn comprises extruding a spinning raw liquid from the circular nozzles 1 of a spinneret into a non-coagulating gas, fusing the extruded fibers each other for each fundamental unit and subsequently introducing the fused fibers into a coagulating liquid. The spinneret has a plurality of fundamental units having circular nozzles in different numbers, respectively, and each having one or more circular nozzles 1 having an identical diameter, has a nozzle distance L of <=0.6 mm between adjacent circular nozzles in the fundamental units, and has a nozzle distance L/nozzle diameter R ratio of <=3.0.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mixed yarn of different acrylic fineness and different cross section having a novel feeling, a method for producing the same, and a spinneret used therefor.

[0002]

2. Description of the Related Art In natural fibers used for clothing, for example, wool and silk, individual fibers have a large variation in fineness as compared with synthetic fibers. However, this variation in fineness should be referred to as an advantage rather than a disadvantage, and the swelling is higher, the touch is softer, and the waist is stronger than a synthetic fiber product. In the case of synthetic fibers, it has been conventionally studied to intentionally blend short fibers of different fineness when using short fibers, or to use mixed fibers with different fineness when using long fibers.

[0003] In the case of acrylic fibers, short fibers have conventionally been the mainstream, and thus a method of mixing short fibers having different finenesses in a spinning process has been adopted. However, various difficulties are encountered when trying to obtain mixed fineness yarns made of acrylic long fibers. When making a mixed fiber with different fineness by the wet spinning method, for example, using one spinneret or using a plurality of spinnerets, the diameter of the spinning hole is made different or the discharge speed is changed. Although fine fibers have a higher coagulation speed in the coagulation bath, they are less likely to be drafted than thicker fibers, and the spinning speed must be adjusted to the fine fiber production conditions. The speed will be reduced.

As a solution to this problem, Japanese Patent Publication No. 59-4
No. 7725, Japanese Patent Publication No. Sho 60-2405, adopt a dry-wet spinning method, and make a difference in the diameter of the spinning hole.
There has been proposed a method of obtaining a mixed-filament yarn at high speed without causing a large difference in draft between the fibers. However, in such a method, the spinning hole having a smaller diameter has difficulty in initial spinning, that is, it is difficult to wash the nozzle surface, leading to deterioration of spinning stability, and it is difficult to define fineness at the time of producing a spinneret. Further, after simultaneous spinning of multi-core conjugate fibers having different numbers of cores as proposed in JP-A-56-43422,
The method of dividing by removing components complicates the process and increases the manufacturing cost.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned conventional problems and to provide a novel texture mixed acrylic yarn of different cross-section, a method for producing the same, and a spinneret excellent in spinning stability used therefor. Is to provide.

[0006]

A first gist of the present invention is as follows.
The ratio of the single-fiber fineness of the fine-fiber to the fineness of the fine-fiber is 1.5 / 1 to 20/1, and the ratio of the single-fiber of the fine-fiber to the fine-fiber is 1/30. The fineness of the fine fiber is 3 to 15 denier, the fineness of the fine fiber is 0.3 to 1.5 denier, and the cross section of the fine and fine fibers is different. The second gist is that one or more circular holes having the same diameter are used as a basic unit, and there are a plurality of basic units having different numbers of constituent circular holes. And acrylic having a hole interval (L) between adjacent circular holes in the basic unit of 0.6 mm or less and a ratio (L / R) to a hole radius (R) of 3.0 or less. The spinneret for the production of mixed fibers with different fineness and different cross section is in the spinneret.
Using the spinneret, the spinning dope discharged into the non-coagulable gas from each circular hole is fused for each basic unit, and then introduced into the coagulation liquid. In the manufacturing method.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION According to the present invention, the ratio of the single fiber fineness of the fine fiber to the fineness of the fine fiber is 1.5 / 1 to 20 /.
1 and preferably 2/1 to 10/1. This ratio is less than 1.5 / 1,
That is, when the difference between the single fiber fineness of the large fineness fiber and the single fiber fineness of the fine fineness fiber is reduced, the mixing effect cannot be substantially expressed,
It is not possible to obtain a mixed fiber having a soft texture and a firm texture. On the other hand, if this ratio is greater than 20/1, the texture of the mixed yarn becomes substantially dominated by the fiber characteristics of the thick fine fiber, and the mixed yarn has a coarse and hard texture.

[0008] The mixed fiber of different acrylic fineness and different cross section of the present invention is
The ratio of the number of single fibers of the fine-fiber fibers to the number of single fibers of the fine-fiber fibers is in the range of 1/30 to 1/1. The ratio of the number of single fibers is preferably selected so as to increase the number of fine fibers. If this ratio is less than 1/30, the fiber-mixing effect cannot be exhibited, and a mixed fiber having a soft texture and a stiff texture cannot be obtained. On the other hand, when this ratio is greater than 1/1, the texture of the mixed fiber becomes largely controlled by the fiber characteristics of the large fineness fiber, and a mixed fiber having an excellent texture cannot be produced.

[0009] In the mixed fiber of different acrylic fineness and different cross section of the present invention, the fineness of the fine fiber is 3 to 15 denier, and the fineness of the fine fiber is 0.3 to 1.5 denier.
If the single fiber fineness of the fine fiber is less than 0.3 denier, the spinning stability becomes poor. On the other hand, if the single fiber fineness of the large fineness fiber exceeds 15 denier, it tends to have a rough and hard texture,
Further, the coagulation of the yarn in the coagulation bath may be incomplete. By setting the single fiber fineness of the large fineness fiber to 3 to 15 denier and the single fiber fineness of the fine fineness fiber to 0.3 to 1.5 denier, the texture is the best and the workability is stable.

[0010] Further, the mixed fiber of different fineness and different cross section of the present invention is characterized in that the cross-section of the fine fineness fiber and the fineness of the fine fiber are different. The cross-sectional shape differs depending on the fineness, such as a thick fine fiber, a fine fine fiber, or a fiber having an intermediate fineness. For this reason, it has not only an unprecedented feeling effect but also an appearance gloss effect.

[0011] The spinneret of the present invention is used for producing the above-mentioned mixed fiber of different acrylic fineness and different cross section by discharging a spinning dope from a spinning hole of the same diameter to achieve remarkable stabilization of the spinnability. It is.

That is, in producing an acrylic mixed fiber with different fineness and different cross section, one or more circular holes having the same diameter are used as a basic unit, and a plurality of basic units having different numbers of circular holes are present. And the distance (L) between adjacent circular holes is 0.6 mm or less, and the ratio (L) to the hole radius (R) is
/ R) is 3.0 or less. Hereinafter, a spinneret for producing an acrylic fiber with different fineness and a different cross section of the present invention will be described with reference to the drawings.

FIG. 1 shows a partial schematic view of an example of the spinneret of the present invention. In FIG. 1, 1 indicates a circular spinning hole, and all the hole diameters are the same. 2 is a basic unit having two circular holes, and 3 is a basic unit having three circular holes. Thus, there are a plurality of basic units having different numbers of circular holes. FIG. 2 is a schematic diagram showing a ratio (L / R) of a hole interval (L) and a hole radius (R) of adjacent circular holes in the basic unit.

Since the spinning holes of the basic unit 2 and the spinning holes of the basic unit 1 have the same diameter, the pressure losses of all the spinning holes in the spinneret are the same, and a uniform and stable discharge of the spinning solution is achieved. This makes it possible to easily set the fineness.

Further, the hole interval (L) between adjacent circular holes in the basic unit is 0.6 mm or less, and the hole radius (R)
And the ratio (L / R) is 3.0 or less, the spinning solution discharged from the spinning hole is fused in adjacent circular hole units in each basic unit. Since the number of circular holes constituting the basic unit 1 and the basic unit 2 is different, the single fiber fineness obtained from the basic unit 1 and the single fiber fineness obtained from the basic unit 2 are different, and a mixed fiber with different fineness and different cross section is obtained. In the basic unit, when the hole interval (L) of the circular holes is larger than 0.6 mm or L / R
Is greater than 3.0, the spinning solution discharged from each circular hole does not fuse, and a mixed fiber with different fineness and different cross section cannot be obtained.

If the above conditions are satisfied, the arrangement of the circular holes in the basic unit can be arbitrarily changed. For example, as shown in FIG. The basic unit 2 has the same number as that of the basic unit 2 in FIG. 1, but the basic unit 2 has two holes arranged along the circumference of the spinneret, while the basic unit 4 has an array in the center direction of the spinneret. doing. Similarly, the basic unit 5 has the same number of circular holes as the basic unit 3, but the arrangement is different, and the cross section of the obtained single fiber is different. In addition, FIG. 1 shows only the basic units having the same number of circular holes at the same radius of the spinneret, but FIG. 3 shows the arrangement of the basic units 4 at the same radius of the spinneret.
And the basic unit 5 are alternately arranged. Accordingly, the mixed fiber having different fineness and different cross section obtained from the spinneret shown in FIG. 1 and the mixed fiber having different fineness and different cross section obtained from the spinneret shown in FIG. 3 have different mixed states. The arrangement of the basic units and the arrangement of the spinning holes in the basic units can be arbitrarily selected according to the ease of machining of the spinneret, the cross-sectional shape of the heterogeneous mixed yarn to be obtained, the mixed state, and the like. .

The cross-sectional shape can be variously changed depending on the number and arrangement of the spinning holes in the basic unit. For example, in the case of the arrangement of FIG. 1, two types of mixed fine yarns with different finenesses of flat cross section are obtained, and in the case of FIG. A yarn is obtained. Of course, in the case of a basic unit having one circular hole, a cross-sectional shape close to a circle can be obtained. FIG. 4 shows the number and arrangement of circular holes of still another basic unit.
FIGS. 5 and 6 show schematic diagrams of the obtained cross-sectional shapes, respectively.
8 and 9. As will be described later, the cross-sectional shape can be changed to some extent depending on the distance between the spinneret and the liquid surface of the coagulation bath. Conventionally, when obtaining fibers of different cross-sections, holes having a complicated shape were required. However, all of the spinnerets of the present invention consisted of only circular holes having the same diameter and the easiest hole drilling. Not only the work accuracy of the base is improved, but also the yield of the base is improved. By using the spinneret as described above, a mixed fiber having a different fineness and a different cross section can be easily obtained.

In the spinneret of the present invention, the ratio of the number of constituent circular holes between basic units having different numbers of circular holes is preferably 1.5 / 1 to 20/1.
It is more preferable that the ratio be 2/1 to 10/1. When this ratio is less than 1.5 / 1, the difference in single fiber fineness between the fine and fine fibers is reduced, the blending effect cannot be exhibited, and the blended fiber has a soft texture and a firm texture. It becomes difficult to make yarn. On the other hand, if this ratio exceeds 20/1, the fineness of the large fineness fiber becomes excessively large, and the texture of the obtained mixed fiber is largely controlled by the characteristics of the large fineness fiber, so that the texture tends to be coarse and hard. Become.

In the spinneret of the present invention, the ratio of the number of basic units is preferably 1/30 to 1/1. Further, it is preferable to select a plurality of basic units having different numbers of circular holes so as to increase the number of basic units having a small number of circular holes. The ratio of the number of basic units is 1
If it is smaller than / 30, the fiber mixing ratio will be significantly increased, and the fiber mixing effect will be diluted. On the other hand, when the ratio of the number of the basic units is larger than 1/1, the number of the basic units constituting the large fineness fiber increases, so that the texture of the obtained mixed yarn is largely controlled by the characteristics of the large fineness fiber. And it becomes easy to make a mixed fiber having an excellent texture.

As described above, the ratio of the number of constituent circular holes between basic units having different numbers of circular holes is 1.5 / 1 to 20/1, and the ratio of the number of basic units is 1/30 to 1/1. By using the spinneret, the texture of the mixed fiber with different fineness and different cross section becomes the best.

Next, the manufacturing method of the present invention will be described. The spinning stock solution discharged into the non-coagulable gas from each circular hole of the spinning nozzle for producing a mixed fiber yarn having the different fineness is fused for each basic unit, and then introduced into the coagulation liquid to thereby obtain the different fineness. The spinning of the mixed fiber becomes possible.

Since the spinning dope discharged from each circular hole is fused for each basic unit and then plastically deformed while being introduced into the coagulation liquid, the distance between the spinneret and the liquid surface of the coagulation bath is 2 to 50.
mm is desirable. If it is less than 2 mm, although it depends on L / R, a phenomenon that the spinning dope discharged from each circular hole does not fuse for each basic unit tends to occur. On the other hand, if it exceeds 50 mm, fusion with other basic units may occur. Therefore, the distance between the spinneret and the liquid surface of the coagulation bath is 2-5.
0 mm is preferable, and 3 to 25 mm is more preferable.

In obtaining a mixed fiber having a different fineness and a different cross section, the distance between the spinneret and the liquid surface of the coagulation bath is set within the range described above.
The shape of the cross section of the single fiber can be changed to some extent by changing the distance between the spinneret and the liquid surface of the coagulation bath. The longer the distance, the more round the cross section.

The mixed fiber of different acrylic fineness and different cross section of the present invention is
It can be manufactured as follows. The acrylic polymer suitable for producing the mixed fiber with different acrylic fineness and different cross section of the present invention contains acrylonitrile in an amount of 50% by weight or more and an unsaturated monomer copolymerizable therewith. Examples of copolymerizable unsaturated monomers include acrylic acid, methacrylic acid, and derivatives thereof, vinyl acetate, acrylamide, methacrylamide, vinyl chloride, vinylidene chloride, and, depending on the purpose, sodium vinylbenzene sulfonate and methallyl sulfonic acid. An ionic unsaturated monomer such as soda and sodium acrylamidomethylpropanesulfonate can be used.

As a method for producing the acrylic polymer, suspension polymerization, solution polymerization and the like can be selected, but are not particularly limited.

The molecular weight of the acrylic polymer is not particularly limited as long as it is generally in the range used for the production of acrylic fibers, but is preferably in the range of 100,000 to 1,000,000. A stock solution for spinning is prepared by dissolving an acrylic polymer in a solvent so as to have a concentration of 15% by weight to 28% by weight. It is not preferable because it is extremely difficult to obtain a desired cross-sectional shape. 28% by weight
If it exceeds 3, the stability over time of the spinning dope becomes poor, and the spinnability is undesirably reduced. As a solvent, in addition to organic solvents such as dimethylformamide, dimethylacetamide, and dimethylsulfoxide, nitric acid, an aqueous solution of rhodanate, an aqueous solution of zinc chloride, and the like can be used. Organic solvents are advantageously used.

The spinning solution is once extruded into the air through a spinneret, and then guided to a spinning coagulation bath mainly comprising a solvent for the solution and water. The spin bath conditions are not particularly limited. For example, when dimethylacetamide is used as the solvent, the spin bath is preferably at a temperature of 0 to 40 ° C. and a solvent concentration of 10 to 85%.

The obtained coagulated yarn is stretched, washed and dried by known methods and conditions, and then subjected to a heat relaxation treatment or the like according to the application to impart a well-balanced mechanical property. It becomes a mixed fiber of different cross section.

[0029]

EXAMPLES 93% acrylonitrile, 6% vinyl acetate,
A copolymer comprising 1% of sodium styrenesulfonate and having an average molecular weight of 300,000 was dissolved in dimethylacetamide to prepare a 25% stock solution for spinning, and the temperature was raised to 60 ° C. The distance between the spinneret and the liquid surface of the coagulation bath was set to 15 mm, and this spinning solution was used for two basic units having different numbers of circular holes, and a hole interval (L) between adjacent circular holes in the basic unit.
Is 0.6 mm and the relationship with the hole radius (R) (L / R)
Was extruded from the 1.6 spinneret into the air, and the resulting solution stream was immediately led to a 40 ° C. coagulation bath consisting of 75% dimethylacetamide and 25% water to form fibers. Next, the yarn that has passed through the coagulation bath is guided to a godet roll of 70 m / min in each of the spinnerets, and pulled.
Then, after washing with water, primary stretching 3.0 times in boiling water and drying, a secondary stretching 2.0 times with a hot pin at 180 ° C. was performed. After this, the yarn is further reduced by 7% on a hot plate at 250 ° C.
A relaxation treatment was performed to obtain a mixed fiber of different fineness and different cross section.

The spinning stability and hand effect are summarized in Table 2. The arrangement of circular holes in the basic unit having a large number of circular holes in Table 2 is shown in FIGS. 4 and 5, and the cross sections obtained therefrom are shown in FIGS. Further, those having the same number of circular holes but different total fineness were produced by changing the discharge amount of the spinning dope. A in Table 2 indicates a basic unit having a small number of circular holes, and B indicates a basic unit having a large number of circular holes. However, the symbols in the table are defined as in Table 1.

[0031]

[Table 1]

[0032]

[Table 2]

Further, using the same spinning dope as in Example 1,
A spinneret having an arrangement of circular holes as shown in FIG. 10 comprising a basic unit having 1 circular hole and a basic unit having 5 circular holes.
The hole interval (L) in the basic unit was fixed at 0.6 mm, (L / R) was changed from 0.5 to 3.5, and the distance between the spinneret and the liquid surface of the coagulation bath was set at 5 mm. Under the same spinning conditions as in Example 1, a mixed fiber with a different fineness and a different cross section of 150 denier was prepared. Table 3 summarizes the spinning stability and hand effect.

[0034]

[Table 3]

[0035]

According to the present invention, it is possible to provide a mixed fiber having a different fineness, a different number of single fibers, a different cross-sectional shape for each single fiber, and a new texture having a different texture in a mixed state. In addition, the spinneret and the manufacturing method of the present invention can not only stabilize the spinnability of the above-mentioned mixed fiber of different acrylic fineness and different cross section, but also the spinneret of the present invention has a circular shape, which is the easiest hole-making machine. Further, since the spinneret is formed only of holes having the same diameter, not only the working accuracy of the spinneret is improved, but also the yield of the spinneret is improved.

[Brief description of the drawings]

FIG. 1 is a partial schematic view of an example of a spinneret for producing a mixed fiber with different fineness and different cross section according to the present invention.

FIG. 2 is a schematic diagram showing a ratio (L / R) of a hole interval (L) and a hole radius (R) of adjacent circular holes in a basic unit.

FIG. 3 is a partial schematic view of another example of the spinneret of the present invention.

FIG. 4 is a schematic diagram showing an arrangement of a basic unit having two circular holes.

FIG. 5 is a schematic diagram showing an arrangement of a basic unit having five circular holes.

FIG. 6 is a schematic diagram showing another arrangement of five circular holes in the basic unit.

FIG. 7 is a schematic view of a cross-sectional shape of a single fiber obtained by the basic unit of FIG.

8 is a schematic view of a cross-sectional shape of a single fiber obtained by the basic unit in FIG.

9 is a schematic diagram of a cross-sectional shape of a single fiber obtained by the basic unit in FIG.

FIG. 10 is a partial schematic view of still another example of the spinneret of the present invention.

[Explanation of symbols]

 1 Circular hole 2 Basic unit consisting of 2 circular holes 3 Basic unit consisting of 3 circular holes

Claims (4)

[Claims] The ratio between the single fiber fineness of the fine fineness fiber and the single fiber fineness of the fine fineness fiber is 1.5 / 1 to 20/1, and the number of single fibers of the fine fineness fiber and the number of single fibers of the fine fineness fiber are determined. The ratio is 1/30
The fineness of the fine fiber is 3 to 15 denier, the fineness of the fine fiber is 0.3 to 1.5 denier, and the cross section of the fine and fine fibers is different. Acrylic fibers with different fineness and different cross section. 2. The method according to claim 1, wherein one or more circular holes having the same diameter are used as a basic unit, a plurality of basic units having different numbers of circular holes are present, and a distance (L) between adjacent circular holes in the basic unit is reduced. 0.6 mm or less, and the ratio to the hole radius (R) (L
/ R) is 3.0 or less, the spinneret for producing a mixed fiber of different acrylic fineness and different cross section. 3. The ratio of the number of constituent circular holes between basic units having different numbers of constituent circular holes is from 1.5 / 1 to 20/1, and the ratio of the number of basic units is from 1/30 to 1/1. Certain claim 2
A spinneret for producing a mixed fiber of different acrylic fineness and different cross section as described above. 4. The spinneret according to claim 2 or 3,
A method for producing a mixed fiber of different acrylic fineness and different cross section, wherein the spinning stock solution discharged from each circular hole into a non-coagulating gas is fused for each basic unit and then introduced into a coagulating solution.